Reef Tank - I can't win

[daplatapus]

I forgot to mention as well that this is why you'll see the recommendation of allowing an existing set up to go fallow for 6-8 weeks without any fish to makes sure all the cryptocryon cysts are dead from starvation before re-introduction of any fish back into the system.
As long as you have any fish that they can host on in the tank, you'll never get rid of it.